On the Amazon page for Hitchen's book on Mother Teresa, there are some comments from people who actually did work with her. They seem to agree with Hitchens.
Particularly disturbing is that money sent to help sick children under the care of Mother Teresa was diverted for other uses. She had access to vast amounts of funds but apparently chose not to spend the money on even modestly improved medical facilities that would actually have saved the lives of the people she was caring for.
So what did she spend it on?
a fallacious argument that concludes a proposition to be true because many or all people believe it; it alleges, "If many believe so, it is so." This type of argument is known by several names,[1] including appeal to the masses, appeal to belief, appeal to the majority, appeal to the people, argument by consensus, authority of the many, and bandwagon fallacy, and in Latin by the names argumentum ad populum ("appeal to the people"), argumentum ad numerum ("appeal to the number"), and consensus gentium ("agreement of the clans").
Many of Mother T's critics are perplexed or angry that she wasn't what they wanted her to be and what she never claimed to be: a medical administrator. When people gave her an (unsolicited) donation, she brushed her hands free of it as rapidly as she could.
Hitch is aghast, not because she "misused" the money, but because she literally did not keep it.
One of Hitchens' principal informants was the head of the Communist Party in Calcutta, who hated Mother T. because the publicity (which she did not seek, but which followed her after the Muggeridge documentary) focused so much on the misery in the streets.
She herself talked little about Calcutta and little about herself or her work. She didn't even recruit an army of volunteers. She told people hundreds of times, "Find your own Calcutta."